Communication support system, information processing terminal, radiotelephone network, message server, and recording medium

ABSTRACT

A sender of a message can transmit a message to an unspecified user merely by specifying a condition of space without specifying a recipient of the message, using an information processing terminal transmitting a message not with a user address to specify a user but with an area address (a condition of space) to specify an area within an electric wave reachable range of a radio base station; and a server converting the area address to a user address which specifies a PHS terminal currently located in the area represented by said area address and transmitting the message with a converted address to a switching equipment.

The present application is a continuation of application Ser. No.11,327,465, filed Jan. 9, 2006; which is a continuation of applicationSer. No. 10/211,525, filed Aug. 5, 2002, now U.S. Pat. No. 7,076,247;which is a continuation of application Ser. No. 09/294,012, filed Apr.19, 1999, now abandoned, the contents of which are incorporated hereinby reference.

BACKGROUND OF THE INVENTION

The present invention relates to a communication support system capableof sending a message to the most suitable user with regard to space (orspace and time) even if the sender of the message does not specify thereceiver.

As is generally known, the private paging system and the liaisoncommunication system works are private radio communication systems usedin service areas, such as within the premises or in limited regions.Such private radio communication systems are installed on the assumptionthat people communicate by voice or simple information transfer iscarried out from a host station to subordinate stations. PHS (personalhandyphone system) is a radio system having a high potential for datatransmission. With regard to the private radio system and PHS, there isa detailed description in “Mobile Communications Handbook” jointlyedited by Tadao Saito and Keizo Tachikawa, published by Ohmsha, Nov. 15,1995), for example.

As a system that utilizes position information in a private branchexchange, there is a plant network system disclosed in Japanese PatentApplication No. Hei 8-313837. This system transmits, by using PHSservice, data necessary for plant maintenance to places the plantmaintenance person move to in advance.

In the roaming of the PHS terminal, because the areas where the PHSterminal moves around can be grasped by the PHS service, the PHSterminal can communicates freely in areas other than the preliminarilyregistered area. With regard to the roaming methods, a method isrevealed in Japanese Patent Application Laid-Open No. Hei 7-322340, forexample.

As is well known, message transfer service by a radio system isavailable with information processing terminals or radio paging portablereceivers. In this kind of service, messages are addressed toindividuals, and the sender is required to specify the address of thereceiver or the number of the radio paging portable receiver whensending a message. With regard to the message transfer method to a radiopaging portable receiver, a method is revealed in Japanese PatentApplication Laid-Open No. Hei 6-86354, for example.

As mentioned above, in the prior art, it is possible to obtain positioninformation about the user and transfer a message to the user by using aradio system. However, because the sender of a message is required tospecify the address of a person as a receiver of the message, it is notalways possible to provide message transmission service that can respondto changes in the location or situation of a message receiver.

When there is a message to any user in a given area at a given time, itis more often important to send the message to that area at that timerather than send it to the person.

In a plant operation monitoring system, for example, the plantmaintenance person performs periodic inspection in which he/she takesmeasurements and inspect the equipment in the field. If there are anumber of maintenance persons in the plant and a request is issued tocheck a specific device, an instruction message should preferably betransmitted not to a specific maintenance person but to a maintenanceperson closest to that device.

Suppose that a message is going to be sent to a person at place B attime A and the request given is that the recipient of the message may beanybody.

In the past, the sender of a message is required to follow a two-stepprocedure:

Step 1: When time A comes, tracing is performed to find who is at placeB.

Step 2: The user at place B is determined, and a message is sent to anaddress of that user.

SUMMARY OF THE INVENTION

The present invention enables transmission of a message only by a singlestep by regarding time A and place B as a kind of address.

More specifically, the object of the present invention is to make itpossible for a message sender to transmit a message only by specifying acondition of space (or conditions of space and time) to an unspecifieduser who meets the condition or conditions without specifying therecipient of the message. Therefore, the present invention can provide acommunication support system that enables a user moving from place toplace to receive a message appropriate to that specified place (orspecified place and time).

To accomplish the above objects, according to the present invention,there is provided a communication support system connected to aradiotelephone network which includes a plurality of radio base stationsset up to cover different areas, and a switching equipment having afunction for managing position information about radiotelephoneterminals which are currently present in the respective areas, whereinthe communication support system comprises:

at least one information processing terminal and a server connected witheach other through a network,

wherein the information processing terminal includes:

first message transmitting means for transmitting a message with adesired area as the destination to the server, and

wherein the server includes:

position information obtaining means for obtaining position informationmanaged by the switching equipment;

message receiving means for receiving a message transmitted from theinformation processing terminal;

radiotelephone terminal determining means for determining, on the basisof position information obtained by the position information obtainingmeans, radiotelephone terminals present in an area of an address of themessage received by the message receiving means; and

second message transmitting means for setting at least one of theradiotelephone terminals determined by the radiotelephone terminaldetermining means as addresses of the message received by the messagereceiving means and transmitting the message to the switching equipment.

According to the present invention, when a user at an informationprocessing terminal transmits a message addressed to an area, themessage is bound to reach users of radiotelephone terminals in theaddressed area. Therefore, the user at the transmission source, bysimply specifying a condition of space (an area), can transmit a messageto an unspecified user who meets the condition. A user moving about fromplace to place can receive a message appropriate to that specifiedplace.

Note that in the present invention, it may be arranged that the positioninformation obtaining means can obtain position information by makingperiodical access to the information being managed by the switchingequipment or receiving position information sent from the switchingequipment.

It may be arranged that the second message transmitting means can delaytransmitting a message for which the radiotelephone terminal could notbe determined by the radiotelephone terminal determining means until theradiotelephone terminal is determined. Or otherwise, it may be arrangedthat the second message transmitting means can transmit the message tothe switching equipment so that the message is sent to allradiotelephone terminals determined by the radiotelephone terminaldetermining means.

The server may further include destination and transmission sourcemanaging means for managing a radiotelephone terminal to which themessage is addressed and the information processing terminal at themessage transmission source for each message transmitted by the secondmessage transmitting means; reply message receiving means for receivingfrom the switching equipment a reply message from the radiotelephoneterminal that received the message from the second message transmittingmeans; message returning means for transmitting the reply messagereceived by the reply message receiving means to the informationprocessing terminal associated with radiotelephone terminal whichtransmitted the reply message by the destination and transmission sourcemanaging means.

It may be arranged that the message receiving means can receive from theswitching equipment a message transmitted from a radiotelephone terminalby the information processing terminal connected to the radiotelephoneterminal when the information processing terminal which is connected tothe radiotelephone can transmit to the server a message addressed to adesired area by using the radiotelephone terminal.

In the present invention, the first message transmitting means specifiestime information which shows time when the server should transmit themessage, in a message to be transmitted to the server, wherein thesecond message transmitting means changes the address of the message tothe address of a radiotelephone terminal determined by theradiotelephone terminal determining means, and transmits the message tothe switching equipment at a transmission time specified in the messagein time information.

According to the above constitution, if the user at the informationprocessing terminal transmits a message addressed to an area by addingtime information to the message, when time specified in the timeinformation comes, the message will reach the user at the radiotelephoneterminal present in the area written as the address of the message.Therefore, the user at the message-transmission source, by merelyspecifying conditions of space (area) and time (time information), cantransmit a message to an unspecified user conforming to the conditions.For this reason, the users moving from place to place can receive amessage appropriate to that place and that time.

In the present invention, the server may further include transmissionsource managing means for managing the information processing terminalsof the senders of respective messages that are received by the messagereceiving means. Furthermore, with regard to messages for which theradiotelephone terminals could not be determined by the radiotelephoneterminal determining means within a predetermined time limit, the secondmessage transmitting means may be arranged to send the message back tothe information processing terminal, which is related with the messageand managed by the transmission source managing means.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a system block diagram of a network system to which acommunication support system according to a first embodiment of thepresent invention is applied;

FIG. 2 is a functional block diagram of the server 108 shown in FIG. 1;

FIG. 3 is a functional block diagram of the information processingterminal 109 shown in FIG. 1;

FIG. 4 is a functional block diagram of the switching equipment 103shown in FIG. 1;

FIG. 5 is a functional block diagram of the radiotelephone terminal 101shown in FIG. 1;

FIG. 6 is a conceptual diagram showing a flow of messages in the firstembodiment of the present invention;

FIG. 7 is an explanatory diagram showing the format of a messagetransmitted from the information processing terminal in the firstembodiment of the present invention;

FIG. 8 is an explanatory diagram showing the constitution of theposition information management table managed by the switching equipmentin the first embodiment of the present invention;

FIG. 9 is an explanatory diagram showing the constitution of theposition information management table managed by the server in the firstembodiment of the present invention;

FIGS. 10A and 10B are sequence diagrams when the server obtains positioninformation in the first embodiment of the present invention;

FIG. 11 is a hardware block diagram of the server in the firstembodiment of the present invention;

FIGS. 12A and 12B are flowcharts of the message transmitting process bythe server in the first embodiment of the present invention;

FIGS. 13A, 13B and 13C are explanatory diagrams showing examples ofscreen displays of the information processing terminal on the messagereceiving side in the first embodiment of the present invention;

FIGS. 14A and 14B are explanatory diagrams each showing an example ofscreen image of the information processing terminal on the messagetransmitting side in the first embodiment of the present invention;

FIG. 15 is an explanatory diagram showing the constitution of thetransmission source management table managed by the server in Appliedexample 1 of the first embodiment of the present invention;

FIG. 16 is a conceptual diagram showing the flow of messages in Appliedexample 2 of the first embodiment of the present invention;

FIG. 17 is a conceptual diagram showing the flow of messages in Appliedexample 3 of the first embodiment of the present invention;

FIG. 18 is a conceptual diagram showing the flow of messages in Appliedexample 4 of the first embodiment of the present invention;

FIG. 19 is a conceptual diagram showing the flow of messages in a secondembodiment of the present invention;

FIG. 20 is an explanatory diagram showing the format of a messagetransmitted from the information processing terminal in the secondembodiment of the present invention;

FIG. 21 is a functional block diagram of the switching equipment 103 ashown in FIG. 19;

FIG. 22 is a conceptual diagram showing the flow of messages in a thirdembodiment of the present invention;

FIG. 23 is a conceptual diagram showing the flow of message in the thirdembodiment of the present invention;

FIG. 24 is a functional block diagram of the server 108 a shown in FIG.23;

FIG. 25 is an explanatory diagram showing the constitution of the areaaddress management table managed by the server in the third embodimentof the present invention;

FIG. 26 is a functional block diagram of the switching equipment 103 ashown in FIG. 23;

FIGS. 27A-27C are sequence diagrams when the server transmits a messagein the third embodiment of the present invention;

FIG. 28 is an explanatory diagram showing an example of screen displayof a telephone terminal or a PHS terminal in Applied example 1 of thethird embodiment of the present invention; and

FIG. 29 is a conceptual diagram showing the flow of message in Appliedexample 1 of the third embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The preferred embodiments of the present invention will be describedwith reference to the accompanying drawings.

First Embodiment

Description will start with a first embodiment of the present invention.

FIG. 1 is a system block diagram of a network system to which thecommunication support system according to the first embodiment isapplied.

As shown in FIG. 1, the communication support system according to thefirst embodiment has a server 108 and information processing terminal109, such as a PC (personal computer), a WS (workstation), etc.connected to LAN 106.

And the communication support system according to the first embodimentis connected to a radiotelephone network 104, which includes a pluralityof radiotelephone terminals 101, a plurality of radio base stations 102,and a switching equipment 103. A portable information processingterminal 105 is connected to each of the radiotelephone terminals 101. Aswitching equipment 103 is connected to a telephone network 107, whichhas a plurality of telephone terminals 110 connected thereto.

The radiotelephone terminal 101 and the information processing terminal105 are defined as separate devices. However, a radiotelephone terminal101 and an information processing terminal 105 may be a unified body,such as an information processing terminal with a built-in transmitter.

Here, as a radiotelephone terminal 101, a PHS (personal handyphonesystem) terminal is used, which has a narrow electric wave reachablerange of about 200 m from a radiotelephone base station 102 and also hasa high potential for data transmission.

Description will now be given of the devices constituting the networksystem shown in FIG. 1.

FIG. 2 is a functional block diagram of the server 108.

In FIG. 2, the switching equipment 103 obtains position information, andby this position information, a position information obtaining means1081 updates the position information management table in a memory 1082for the table. A message receiving unit 1083 receives a messagetransferred from the information processing terminal 109 through LAN106. On receiving the message from the message receiver 1083, aradiotelephone terminal determining unit 1084, by referring to theposition information management table in the table memory 1082,determines a radiotelephone terminal 101 present in an area of anaddress which is added to the message, as the destination address of themessage. A destination and transmission source managing unit 1085changes the destination address of the message, transmitted from theinformation processing terminal 109 and received by the messagereceiving unit 1083, from the area address on the message to the number(user address) of the radiotelephone terminal 101 determined by theradiotelephone terminal determining unit 1084. The destination andtransmission source managing unit 1085 further relates the changedaddress to the information processing terminal 109 at the transmissionsource, and registers the address in the transmission source managingtable stored in the transmission source managing table memory 1086. Amessage transmitting unit 1087 transmits the message, in which thedestination and the sending station were changed, to the switchingequipment 103. A reply message receiving unit 1088 receives from theswitching equipment 103 a reply message transmitted from theradiotelephone terminal 101. When receiving the reply message, thedestination and transmission source managing unit 1085 determines thedestination of the reply message from the sender of the message byreferring to the transmission source management table stored in thetransmission source management table memory 1086, and changes the replymessage to one with the determined reply address. A reply messagetransmitting unit 1089 sends onto LAN 106 the reply message for whichthe destination was determined by the destination and transmissionsourc6 managing unit 1085. The user addresses of the radiotelephoneterminals 109 present at this moment in the areas are registered on theposition information management table stored in the position informationmanagement table memory 1082 for every area address. With regard to eachmessage received from the radiotelephone terminal determining unit 1084,the address of the radiotelephone terminal 101, which is the destinationaddress of message and the address of the information processingterminal 109 which is the transmission source are registered on thetransmission source information management table stored in thetransmission source information management table memory 1086. Note thata memory 1090 for untransmitted messages stores those messages that arenot immediately transmitted to the switching equipment 103 out of allmessages received at the message receiving unit 1083.

The server 108 in FIG. 2 is realized in an information processing unitincluding CPU 701, a memory 702, a secondary memory device 703, aswitching equipment interface 704, and a LAN interface 705 as shown inFIG. 11 20 as a process controlled by CPU 701, which loads a programfrom the secondary memory device 703 into the memory 702 and executesthe program switching equipment.

FIG. 3 is a functional block diagram of the information processingterminal 109 shown in FIG. 1.

In FIG. 3, a user interface unit 1091 accepts an input message from theuser, and displays the accepted message or a reply message. A messagetransmitting unit 1092 sends onto LAN 106 the message with an areaaddress accepted through the user interface 1091. A message receivingunit 1093 receives a reply message addressed to itself, and sends thereply message to the user interface 1091.

The information processing terminal shown in FIG. 3 is realized as aprocess controlled by CPU 701 which loads a program from the secondarymemory device 703 into the memory 702 and executes the program when theserver is formed as an information processing unit shown in FIG. 11 withthe switching interface 704 omitted.

The information processing terminal 105 shown in FIG. 1 is basically thesame as the one shown in FIG. 3 excepting that the message transmittingunit 1092 and the message receiving unit 1093 are externally connectedto radiotelephone terminals 101, not to the LAN 106 as in FIG. 3.

FIG. 4 is a functional block diagram of the switching equipment 103shown in FIG. 1.

In FIG. 4, a position information managing unit 1031 obtains, from theradiotelephone terminal 101 supplied with power source, informationabout which area the radiotelephone terminal 101 is located in, andmanages the position information by the position information managementtable stored in the position information management table memory 1032.When power is supplied and periodically after power has been supplied tothe radiotelephone terminal 101, the radiotelephone terminal 101 issuesa position information signal. The position information of theradiotelephone terminal 101 is obtained by checking through which radiobase station 102 the position information signal thus issued wasreceived. The switching equipment 103, which has obtained positioninformation of the radiotelephone terminal 101, refers to the positioninformation management table stored in the position informationmanagement table memory 1032, and if there is any change in the user'sarea (in other words, in the corresponding radio base station 102 whichreceived the position information signal), the switching equipment 103updates the position information management table stored in the positioninformation management table memory 1032. The position informationmanaging unit 1031 sends the contents of the position informationmanagement table stored in the position information management tablememory 1032 to the server 108 periodically or in response to a commandfrom the server 108.

A data receiving unit 1033 receives a message sent from the server 108.A data transmitting unit 1034 obtains an area where there is theradiotelephone terminal 101 at the address added to the message receivedby the data receiving unit 1033 from the position information tablestored in the position information management table memory 1032. Thedata transmitting unit 1034 transmits the message to the radiotelephoneterminal 101 at its destination address through the radio base station102 managing the area obtained. A data receiving unit 1035 receives areply message from the radiotelephone terminal 101 through the radiobase station 102. A data transmitting unit 1036 transmits the replymessage received by the data receiving unit 1035 to the server 108 atthe address of the reply message.

The switching equipment 103 in FIG. 4 is the same as the oneconventionally used, excepting that the contents of the positioninformation management table in the position information managementtable memory 1032 periodically or in response to a command from theserver 108. The hardware constitution of the switching equipment is thesame as the one conventionally used, and the description thereof isomitted.

FIG. 5 is a functional block diagram of the radiotelephone terminal.

In FIG. 5, a data incoming unit 1011 performs the incoming messageprocess, addressed to its own radiotelephone terminal, which wastransmitted from the switching equipment 103 through the radio basestation 102 controlling the area where the radiotelephone terminalitself exists. A data transmitting unit 1012 transmits the message,which arrived at the data incoming unit, to the information processingterminal 105 connected to itself.

A data receiving unit 1013 receives a reply message sent from theinformation processing terminal 105 connected to itself. A dataoriginating unit 1014 originates the reply message received at the datareceiving unit 1013. The reply message is sent to the switchingequipment 103 through the radio base station 102 controlling the areawhere the radiotelephone terminal 101 itself exists.

The position information originating unit 1015 originates a positioninformation signal when power is supplied and periodically after powerhas been supplied. This position information is sent to the switchingequipment 103 through the radio base station 102 controlling the areawhere the radiotelephone terminal 101 itself exists.

The radiotelephone terminal 101 shown in FIG. 5 is the same as thosewhich have been conventionally used. The hardware constitution of theradiotelephone terminal 101 is the same as that of the radiotelephoneterminals conventionally used and the description thereof is omitted.

Description will be given of the flow of messages in the network systemconfigured as described above.

FIG. 6 is a conceptual diagram showing the flow of messages in the firstembodiment.

As shown in FIG. 6, according to the first embodiment, a message sentfrom the information processing terminal 109 is transmitted by theserver 108 through the switching equipment 103 to the informationprocessing terminal 105 connected to the radiotelephone terminal 101. Areply message from the information processing terminal 105 istransmitted to the information processing terminal 109 by travelingalong the same route in reverse direction. FIG. 7 is an explanatorydiagram showing the format of a message transmitted from the informationprocessing terminal 109.

As shown in FIG. 7, a message that is sent from the informationprocessing terminal 109 consists of a destination address 301, atransmission source user address 302, and a data portion 303.

The first embodiment of the present invention makes it possible for auser at the transmission source to transmit a message to an unspecifieduser who meets only the condition of space (or conditions of space andtime) that the sender specifies without specifying a user at adestination.

Therefore, in the first embodiment, it is arranged that not a useraddress that specifies the user but an area address (plant 1 in theexample in FIG. 6) that specifies an electric wave reachable range isset as the destination address 301 of the message. Furthermore, in thedestination address 301, a transmission waiting time or a specifiedtransmission time may be set in addition to the area address. The areaaddress set in the destination address 301 is for specifying a conditionof space. The transmission waiting time or specified transmission timeset in the destination address 301 is for specifying a condition oftime.

Setting an area address and a specified transmission time may be done bythe user using the user interface 1091 shown in FIG. 3.

In the first embodiment, the server 108 changes the area address to auser address of the radiotelephone terminal 101 determined by theradiotelephone terminal determining unit 1084 shown in FIG. 2 (#4 in theexample in FIG. 6) in order that the message transmitted from theinformation processing terminal 109 is further transmitted to theinformation processing terminal 105 connected to the radiotelephone(PHS) terminal 101 currently located in an area indicated by the areaaddress set in the destination address 301 of the message.

If transmission waiting time or specified transmission time has beenadded to the destination address 301 of the message transmitted from theinformation processing terminal 109, the server 108, after havingchanged the area address to the user address of the radiotelephoneterminal 101 determined by the radiotelephone terminal determining unitshown in FIG. 2 (#4 in the example in FIG. 6), temporarily stores themessage in the untransmitted message memory 1090. When theabove-mentioned transmission waiting time has elapsed or specifiedtransmission time comes, the radiotelephone terminal determining unit1084 fetches the message from the untransmitted message memory 1090 andtransmits it.

In the first embodiment, the server 108 needs to manage the positioninformation of the radiotelephone terminals 101 for conversion of thearea address set in the destination address 301 of a message transmittedfrom the information processing terminal 109. Therefore, descriptionwill be made of the method of managing position information.

FIG. 8 is a diagram for explaining the constitution of a positioninformation management table 401 stored in the memory 1032 for theposition information management table, which the switching equipment 103uses in managing the position information of the radiotelephoneterminals 101.

As shown in FIG. 8, each entry in the position information managementtable 401 stored in the position information management table memory1032 consists of a field 402 for storing an area number as the ID numberof a radio base station 102 and a field 403 for storing a PHS number asthe ID number of a radiotelephone (PHS) terminal 101.

The switching equipment 103 manages PHS numbers of the PHS terminals 101currently located in respective areas by associating them with the areanumbers of the areas of the radio base stations 102. More specifically,when the position information management unit 1031 shown in FIG. 4detects that a PHS terminal 101 moves from one area to another area, theswitching equipment 103 updates the PHS number fields 403 of the areasinvolved in the movement.

FIG. 9 is an explanatory diagram showing the constitution of theposition information management table stored in the position informationmanagement table memory 1082 which the server 108 uses for managing theposition information of the radiotelephone (PHS) terminals 101.

As shown in FIG. 9, each entry of the position information managementtable 501 stored in the position information management table memory1082 consists of a field 502 for storing an area address, a field 503for storing an area number, and a field 504 for storing a user address.

The server 108 manages the area numbers of the areas of the radio basestations 102 by associating them with the area addresses set in thedestination address 301 of a message transmitted from the informationprocessing terminal 109 according to the position information managementtable 501. The relation between the area numbers and the area addressesin this table is arranged on an n-to-n correspondence, where n=1 ormore. However, this relation may be arranged such that one area addressis related to a plurality of areas.

The server 108 manages, as to the respective area numbers of the areasof the respective radio base stations, the user addresses whichdetermine the PHS terminals 101 in the area specified by the areanumber, using the position information management table 501. Note thatsince the user addresses are related to the PHS terminals 101 on aone-to-one correspondence, the PHS numbers are used as the useraddresses.

The server 108 updates the user address field 504 according to positioninformation of the PHS terminal 101 obtained from the switchingequipment 103 by the position information obtaining unit 1081 asdescribed later.

FIG. 10 is a sequence diagram showing the server 108 obtaining positioninformation of a radiotelephone (PHS) terminal 101 from the switchingequipment 103.

FIG. 10A shows a process that position information managed by theswitching equipment 103 is obtained by the server 108 periodicallyaccessing (by polling) the switching equipment 103.

The server 108 obtains position information managed by the switchingequipment 103 by its position information obtaining unit 1081 accessing(by polling) the switching equipment 103 and compares the obtainedposition information with the position information that the server 108itself possesses. If there is any change, the server 108 updates theuser address field 504 in the position information management table 501.

FIG. 10B shows a process that the switching equipment 103, when itdetects a position movement of a PHS terminal 101, notifies this to theserver 108. The switching equipment 103 manages the updating conditionof the position information management table 401 by its positioninformation managing unit 1031, and if there is any update, transmitsupdated position information to the server 108. In response, the server108, on receiving the notification from the switching equipment 103 atits position information obtaining unit 1081, updates the user addressfield 504 in the position information management table 501.

Description will next be given of the message transmission process ofthe server 108.

As described above, the server 108 is configured as an informationprocessing device including a CPU 701, a memory 702, a secondary memory703, a switching equipment interface 704, and LAN interface 705 as shownin FIG. 11. The CPU 701, which loads a program stored in the secondarymemory 703 and executes the program on the memory 702, realizes themessage transmission process described below.

Description will now be made of a case, taken as an example, where onlyan area address (a condition of space) is entered in the destinationaddress 301 of a message transmitted from the information processingterminal 109. It is when a message from the information processingterminal 109 arrives at the server 108 that the server 108 transmits themessage which is transmitted from the information processing terminal109 to the radiotelephone terminal 101.

FIG. 12 is a flowchart of the message transmission process by the server108.

In FIG. 2, when the server 108 receives a message from the informationprocessing terminal 109 through LAN 106 at its message receiving unit1083, the radiotelephone terminal determining unit 1084 reads an areaaddress in the destination address 301 of the message (step 801) asshown in FIG. 12A, and checks the user address field 504, whichcorresponds to the area address read at step 801, in the positioninformation management table 501 stored in the position informationmanagement table memory 1082. The server 108 then checks whether or notthere is a user in the area with that area address (step 802).

If there is a user in the area of that area address (step 802), theradiotelephone terminal determining unit 1084 sets the user address inthe destination address 301 (step 803) in place of the area address readat step 801. The server 108 transmits the message from the messagetransmitting unit 1087 (step 804). When there are a plurality of usersin the same area, the radiotelephone terminal determining unit 1084selects one user. For this selection of a user, no method is defined.

On the other hand, if there is no user in the area of that area address(step 802), the radiotelephone terminal determining unit 1084 stores themessage in the untransmitted message memory 1090 (step 805). Messagesare stored classified by area addresses.

When the user address field 504 in the position information managementtable 501 has been updated according to the position informationobtained by the position information obtaining unit 1081 by a methodshown in FIG. 10A or FIG. 10B, the radiotelephone terminal determiningunit 1084 checks, as shown in FIG. 12B, if a message with an areaaddress, which corresponds to the updated user address, entered in thedestination address 301, is stored in the untransmitted message memory1090 (step 811).

When such a message is stored (step 811), the radiotelephone terminaldetermining unit 1084 sets the updated user address in the destinationaddress 301 in place of the area address previously set in the address301 of the message (step 812), and then the server 108 transmits themessage from the message transmitting unit 1087 (step 813).

By this arrangement, when it occurs that there is a user in the arearepresented by the area address set in the destination address 301 of amessage among the messages stored at step 805 in FIG. 12A, the server108 transmits the message to the switching equipment 103.

A message transmitted from the server 108 to the switching equipment 103is transmitted to a PHS terminal 101 with a user address (PHS number)set in the destination address 301 of the message by an incoming messageprocess by the switching equipment 103, which is a well-known technique,and then transmitted to the information processing terminal 105connected to the PHS terminal 101.

The information processing terminal 105 shows the received message onits display. An example of screen display is shown in FIG. 13A. In theexample of FIG. 13A, the contents of a message (data portion 303 of themessage) and the message-transmission source user address (transmissionsource user address 302 of the message) are shown on the display.

The screen display on the message transmitting side will be describedtogether with the explanation of the screen display of the massagereceiving side. The user interface 1091 in the information processingterminal 109 at the message transmission source may be to anyspecification so long as it can transmit a message with an area addressentered in the address 301. For example, as shown in FIG. 14A, when amessage generating editor, which runs on the information processingterminal 109, shows a map of a message transmission area on the displayand the user at the information processing terminal 109 specifies adesired place on the map, the interface 1091 may be arranged to set anarea address, which corresponds to the specified place, into thedestination address.

Moreover, for example, as shown in FIG. 14B, it may be arranged that themessage generating editor, which runs on the information processingterminal 109, shows on the display an address list which relates theactual area information (plant numbers, for example) to the areaaddresses, and the server 108 sets an area address, which corresponds tothe item specified by the user at the information processing terminal109, in the address 301. As has been described, according to the firstembodiment of the present invention, the user at the messagetransmission source can transmit a message by merely specifying acondition of space (or conditions of space and time) to an unspecifieduser who meets the condition or conditions without knowing the locationor the address of a user moving from place to place. Therefore, a useron the move can receive a message, which is appropriate to the place (orthe place and time).

For example, when the first embodiment is applied to a plant operationmonitoring system, it becomes possible for the responsible person formaintenance to transmit an investigation instruction message or amessage notifying the occurrence of abnormality to a maintenance personin the area where a measuring meter at issue is located, withoutmanaging the location of plant maintenance persons in the field. Theplant maintenance person on the message receiving side has only to workin the area where he is at the moment and need not make a wastefulmovement to a distant place.

For example, an information supplier, if he specifies an areacorresponding to the station yard, can send a message notifyingdeparture or arrival time of a train or some other liaison message to auser, who is present in the station yard. In a place of some event, if asupplier of information transmits a message by specifying an areacorresponding to the place of event, he can send guidance of the eventto the users, who are present in the event site. Moreover, a restaurantmanager can transmit the contents of the menu to the users, who are inthe vicinity of the restaurant by limiting the transmission range to thearea corresponding to the neighborhood of the restaurant.

As has been discussed, according to the first embodiment of the presentinvention, it becomes possible to support various forms ofcommunication.

In the first embodiment mentioned above, the message transmissionprocess of the server 108 has been described with reference to a casewhere only an area address (a condition of space) is set in the address301 of a message transmitted from the information processing terminal109. However, when it is arranged that transmission waiting time orspecified transmission time (a condition of time) is additionally set,it is possible that the server 108 temporarily stores the messagereceived from the information processing terminal 109 in theuntransmitted message memory 1090, and when the transmission waitingtime has elapsed or when specified transmission time comes, the samemessage transmission process as that described above is performed.

Some applied cases of the first embodiment will be described in thefollowing.

APPLIED EXAMPLE 1

In the first embodiment, if the server 108 manages the messages receivedfrom the information processing terminal 109, the user address of theinformation processing terminal 109 of the transmission source of themessage and the user addresses of the PHS terminals 101 of thetransmission destination of the message by associating them, it becomespossible for the recipient of the message to transmit a reply messagewithout knowing the user address of the transmission source of themessage he received.

A case according to the above arrangement will be described.

FIG. 15 is an explanatory diagram showing the constitution of thetransmission source management table stored in the transmission sourcemanagement table memory 1085, which the server 108 uses in managing themessage transmission sources.

As shown in FIG. 15, the entries of the transmission source managementtable 1101 stored in the transmission source management table memory1085 include a field 1102 in which a message ID that the server 108assigned uniquely to a message is stored, a field 1103 in which a useraddress of the information processing terminal 109 at the transmissionsource is stored, and a field 1104 for a user address (PHS number) ofthe PHS terminal 101 at the transmission destination is stored.

The destination and transmission source managing unit 1085 shown in FIG.2, when receiving a message from the radiotelephone terminal determiningunit 1084, assigns a message ID to the message, and registers thismessage ID and the user address of the information processing terminal109 at the transmission source respectively into the message ID field1102 and the receiving station user address field 1103. The destinationand transmission source managing unit 1085 registers the user address(PHS number), set in the address 301 of the message, into thedestination user address field 1104, which corresponds to the messageID.

Description will then be given of how a reply message is sent from theuser of the radiotelephone (PHS) terminal 101 and the informationprocessing terminal 105, the recipient of the message.

The user of the PHS terminal 101 and the information processing terminal105, on receiving a message, generates a reply message to respond to themessage, and inputs a reply message transmit instruction.

This first applied example is intended to make it possible to transmit areply message without knowing the user address of the informationprocessing terminal 109 as the transmission source of the message.Therefore, the screen display of a message at the radiotelephoneterminal 105 needs to show the contents of the message (the data portion303) and a reply button 901 as indicated in FIG. 13B.

The user of the PHS terminal 101 and the information processing terminal105, after generating a reply message, presses the reply button toinstruct to transmit a reply message to the information processingterminal 109 at the transmission source of the message.

With regard to the reply button 901, instead of using the informationprocessing terminal 105, it may be arranged that on the display of thePHS terminal 101, a specific number (*1 for example) is displayed, whichoffers the same effect as in pressing the reply button 901 as shown inFIG. 13C. With this arrangement, the user of the PHS terminal 101 andthe information processing terminal 105 may make a notificationmentioned above by pressing the displayed number.

Meanwhile, when the reply button 901 is pressed, the informationprocessing terminal 105 transmits the generated reply message from thePHS terminal 101 through the switching equipment 103 to the server 108.At this time, the under-communication state, created by transmission ofthe message, has been maintained between the PHS terminal 101 and theserver 108.

When receiving the reply message from the reply message receiving unit1088 shown in FIG. 2, the server 108 checks the transmission source useraddress field 1103, which corresponds to the destination user addressfield 1104 where there has been the user address same as that of the PHSterminal 101 at the transmission source of the reply message. The replymessage transmitting unit 1089 transmits the received reply message tothe information processing terminal 109 of the transmission source useraddress stored in the transmission source user address field 1103.

Incidentally, when the reply message transmitting unit 1089 hastransmitted the reply message, the destination and transmission sourcemanaging unit 1085 clears the related entries in the transmission sourcemanagement table 1101. As has been explained, according to this appliedexample, the server 108 manages the messages received from theinformation processing terminals 109 by associating them with the useraddresses of the information processing terminals 109 of thetransmission source, and also with the user addresses of the PHSterminals 101 at the message transmission destination. Therefore, therecipient of a message can transmit a reply message without knowing theuser address of the transmission source of the message.

According to this applied example, it may be arranged that when theserver 108 is going to transmit a message in a message transmittingprocess, if there is not any user in the area at an area address set inthe address 301 of the message, or if there is still not any user in thearea when a predetermined time limit has passed, the server 108 canreturn the message to the information processing terminal 109 at thetransmission source, and clear the related entries in the transmissionsource management table 1101.

APPLIED EXAMPLE 2

In the first embodiment, description has been made on the assumptionthat the user at the message transmission source is a user at theinformation processing terminal 109. However, the user at thetransmission source may be a user moving from place to place (a user atthe PHS terminal 101 and an information processing terminal 105). Theuser on the move can send a message only by specifying a condition ofspace (or conditions of space and time) to an unspecified user who meetsthe condition or conditions without knowing the location or the addressof the unspecified user.

FIG. 16 is a conceptual diagram showing the flow of messages in thissecond applied example.

As shown in FIG. 16, in this second applied example, a message sent fromthe information processing terminal 105 connected to a PHS terminal 101located in “area 2”, for example, is transmitted through the switchingequipment 103 to the server 108, and the server 108 in turn transmitsthe message through the switching equipment 103 to the informationprocessing terminal 105 connected to a PHS terminal 101 located in “area1”.

At this time, the server 108 may handle the message sent from theinformation processing terminal 105 just like a message sent from theinformation processing terminal 109.

APPLIED EXAMPLE 3

In the first embodiment, when there are plurality of users in the samearea at step 802 of FIG. 12A, the server 108 selects one user and sendsa message to him or her. However, the server 108 may broadcasts themessage to all users located in the same area without selecting oneuser. Here, it may be arranged that the user at the message transmissionsource can request that a message be broadcast, and the radiotelephoneterminal determining unit 1084 in the server 108 makes a decisionwhether or not to select one user depending on the presence or absenceof a broadcast transmission request.

FIG. 17 is a conceptual diagram showing the flow of messages in thethird applied example.

As shown in FIG. 17, in this third applied example, a message sent fromthe information processing terminal 105 connected to a PHS terminal 101located in “area 1”” is transmitted through the switching equipment 103to the server 108, and the server 108 in turn transmits the message tothe information processing terminals 105 connected to all PHS terminals101 located in “area 3” through the switching equipment 103.

It is also possible to make an arrangement that the user at the messagetransmission source can specify repetition periods or a number of timesof broadcast when making a broadcast transmission request, theradiotelephone terminal determining unit 1084 of the server 108 stores amessage with specified periods or number of times in the untransmittedmessage memory 1090, and the server 108 broadcasts the message to allusers located in the area at the time of transmission according to thespecified periods and number of times. And, after the message has beentransmitted a specified number of times, the message may be erased fromthe untransmitted message memory 1090. If there is movement of a userwhile broadcast transmission is repeated, the position informationobtaining unit 1081 updates the position information management table501 stored in the position information management table memory 1082, andbroadcasts the message based on updated position information.

According to this third applied example, the user at the messagetransmission source can broadcast an emergency message or the like toall users as the situation requires, by which real time communicationcan be carried out.

APPLIED EXAMPLE 4

In the first embodiment, if the user at the message transmission sourcecan make a broadcast transmission request like in the third appliedexample, with regard to a message sent from the information processingterminal 105 connected to a PHS terminal 101, if no area address is setin the address 301 of the message or if a predetermined specific areaaddress (* for example) is set in the address 301, in other words, ifthe message is a special message, the radiotelephone terminaldetermining unit 1084 determines the area where there are some users atthe message receiving stations and lets all the users in the determinedarea be the destinations.

FIG. 18 is a conceptual diagram showing the flow of messages in thisfourth applied example.

As shown in FIG. 18, in this fourth applied example, for example, amessage sent from the information processing terminal 105 connected to aPHS terminal located in “area 1” is transmitted through the switchingequipment 103 to the server 108, and the server 108 in turn transmitsthe message through the switching equipment 103 to the informationprocessing terminals 105 connected to all PHS terminals 101 located in“area 1”.

For example, in a case where this example is applied to a plantmonitoring system, if an arrangement is made that when an emergencymessage, which has no area address set in the address 301 or which has aspecific area address set previously, is transmitted to the server 108when an emergency button previously provided on the informationprocessing terminal 105 is pressed, then should abnormality, such as anaccident, occur, a plant maintenance person in the field can press theemergency button, by which the emergency message is broadcast to othermaintenance persons in the same area to call for their assistance.

APPLIED EXAMPLE 5

In the first embodiment, if the user at the message transmission sourcecan make a broadcast transmission request like in the third appliedexample, and if the user at the message transmission source can furtherspecify the number of users to whom a message is to be broadcast, theradiotelephone terminal determining unit 1084 of the server 108 canspecify as message recipients the number of users out of all userslocated in the area specified as the destination of the message. Forthis reason, the message can be sent to the specified number of users.

In the above case, if it was impossible to broadcast the message to thespecified number of users in step 802 of FIG. 12A, the radiotelephoneterminal determining unit 1084 of the server 108 temporarily stores themessage in the untransmitted message memory 1090 and manages the usernumbers to which the message was transmitted. Each time the positioninformation management table 401 is updated, the radiotelephone terminaldetermining unit 1084 checks if there is any user who is in the areaspecified as the destination of the message but to whom that message hasnot been transmitted, and if there is any user who has not received thatmessage, sends the message to the user as the destination. This processis repeated until the number of users who received the message amountsto the number of specified users. When the users who received themessage have reached the number of specified users, the message iserased from the untransmitted message memory 1090.

Second Embodiment

Next a second embodiment of the present invention will be described.

The second embodiment of the present invention differs from the firstembodiment in the way in which the recipient of a message sends a replymessage. More specifically, in the second embodiment, the recipient of amessage responds by a voice message from a PHS terminal 101 to thetelephone terminal 110 of the sender of the preceding message. Only thedifferences from the first embodiment will be described in thefollowing.

In the second embodiment, the information processing terminal 105 andthe radiotelephone (PHS) terminal 101 are not provided in a unifieddevice, but need to be separate devices.

FIG. 19 is a conceptual diagram showing the flow of messages in thesecond embodiment.

As shown in FIG. 19, in the second embodiment, a message sent from theinformation processing terminal 109, as in the first embodiment, istransmitted by the server 108 through a switching equipment 103 a to theinformation processing terminal 105 connected to a PHS terminal 101. Areply message (voice message) from the PHS terminal 101 in response tothe initial message is transmitted through the switching equipment 103 aand a telephone network 107 to the telephone terminal 110, which is usedby the user of the information processing terminal 109.

FIG. 20 is an explanatory diagram showing the format of a message sentfrom the information processing terminal 109.

As shown in FIG. 20, in addition to the destination 301, thetransmission source user address 302, and the data portion 303, amessage sent from the information processing terminal 109 furthercontains a transmission source telephone number 304, namely, thetelephone number of the telephone terminal 110 which is used by the userat the information processing terminal 109. The destination, thetransmission source user address and the transmission source telephonenumber can be set by the user through the user interface 1091 shown inFIG. 3.

FIG. 21 is a functional block diagram of the switching equipment 103 ashown in FIG. 19.

The difference of the switching equipment 103 a in FIG. 21 from theswitching equipment 103 shown in FIG. 4 is the additional provision of adestination and transmission source managing unit 1037 and atransmission source management table 1038. The destination andtransmission source managing unit 1037 relates the destination of amessage from server 108, received by the data receiving unit 1033, tothe transmission source telephone number in the message when theabove-mentioned managing unit 1037 registers the destination of themessage into the transmission source management table stored in thetransmission source management table memory 1038. The switchingequipment 103 a, which received a return (voice) message through thedata receiving unit 1035, controls the data transmitting unit 1036 tosend the message to the transmission source telephone number of theinitial message, determined by the transmission source management tablein the transmission source management table memory 1038.

In the second embodiment, because the voice message sent as a reply fromthe recipient of the initial message does not pass through the server108, the switching equipment 103 a needs to manage the transmissionsource telephone number Therefore, description will now be made of howthe transmission source telephone numbers are managed.

FIG. 22 is an explanatory diagram showing the constitution of thetransmission source management table stored in the transmission sourcemanagement table memory 1038, which is used by the switching table 103 afor managing the transmission source telephone numbers.

As shown in FIG. 22, each of entries of the transmission sourcemanagement table 1701 consists of a 20 field 1702 for storing a PHSnumber of the transmission destination of a message and a field 1703 forstoring a transmission source telephone number.

The destination and transmission source managing unit 1037 manages thetelephone numbers of the telephone terminals 110, used by the user atthe information processing terminal 109 at the message transmissionsource, for every PHS number of the PHS terminals 101 at the messagetransmission destination. More specifically, the destination andtransmission source managing unit 1037, when transmitting a message fromthe server 108 to a PHS terminal 101, reads the telephone number set inthe transmission source telephone number 304 in the message, andregisters the telephone number in the transmission source telephonenumber field 1703, which corresponds to the PHS number of the PHSterminal 101 at the message transmission destination.

The user of the PHS terminal 101 and the information processing terminal105, when receiving a message, notifies to the telephone terminal 110used by the user of the information processing terminal 109 at themessage transmission source that he or she is going to send a replymessage (voice message).

The second embodiment is intended to make it possible to respond by avoice message without knowing the telephone number of the telephoneterminal 110 used by the user of the information processing terminal 109at the message transmission source. Therefore, the screen display of amessage at the information processing terminal 105 may be as shown inFIG. 13B for example.

When the reply button 901 is pressed, the information processingterminal 105 sends a notification of reply message transmission throughthe PHS terminal 101 to the switching equipment 103. Note that at thistime the under-communication state created by transmission of themessage has been maintained between the PHS terminal 101 and the server108.

On receiving a notification from the PHS terminal 101 through the datareceiving unit 1035 that the terminal 101 is going to transmit a replymessage, the switching equipment 103, through its destination andtransmission source managing unit 1037, checks the transmission sourcetelephone number field 1703, which corresponds to the PHS number field1702 holding the same PHS number as the PHS number of theabove-mentioned PHS terminal 101, in the transmission source managementtable 1701 stored in the transmission source management table memory1038. By using the data transmitting unit 1036, the switching equipment103 calls through the telephone network 107 the telephone terminal 110of the telephone number stored in the transmission source telephonenumber field 1703. When receiving a reply from the telephone terminal110 at the called side, the switching equipment 103, by using thedestination and transmission source managing unit 1037, switches overfrom the speech channel with the server 108 to the speech channel withthe telephone terminal 110, thus setting up an under-communication statebetween the PHS terminal 101 and the telephone terminal 110.

At the moment the under-communication state is created between the PHSterminal 101 and the telephone terminal 110 at the called side, thedestination and transmission source managing unit 1037 clears theentries concerned in the transmission source management table 1701stored in the transmission source management table memory 1038.

As has been described, according to the second embodiment, the recipientof a message can respond by a voice message without knowing thetelephone number of the user's telephone terminal 110, which is used bythe information processing terminal 109 at the message transmissionsource, so that it becomes possible to carry out communication in realtime by voice.

Third Embodiment

Next, a third embodiment of the present invention will be described.

The difference of the third embodiment from the first embodiment is thatit is made unnecessary for the server 108 a to manage positioninformation of PHS terminals 101. Only differences from the firstembodiment will be described in the following.

FIG. 23 is a conceptual diagram showing the flow of a message in thethird embodiment of the present invention.

As shown in FIG. 23, in the third embodiment, a message sent from theinformation processing terminal 109, like in the first embodiment, istransmitted by the server 108 a through the switching equipment 103 b tothe information processing terminal 105 connected to a PHS terminal 101.

FIG. 24 is a functional block diagram of the server 108 a shown in FIG.23.

The differences of the server 108 a in FIG. 24 from the server 108 inFIG. 2 are that a memory 1082 a for an area address management table isinstalled in place of the position information management table memory1082, and that a destination address obtaining unit 1081 a is providedin place of the position information obtaining unit 1081.

The area address management table memory 1082 a stores an area addressmanagement table 1091 in which the area addresses are related to thearea numbers as shown in FIG. 25. The destination address obtaining unit1081 a transmits an area address, sent from the radiotelephone terminaldetermining unit 1084, to the switching equipment 103 b, and notifiesthe address (destination address) of the radiotelephone terminal 101,received as a reply from the switching equipment 103 b, to theradiotelephone terminal determining 1084.

FIG. 26 is a functional block diagram of the switching equipment 103 bshown in FIG. 23.

The difference of the switching equipment 103 b in FIG. 26 from theswitching equipment 103 in FIG. 4 is the additional provision of aradiotelephone terminal determining unit 1039. The radiotelephoneterminal determining unit 1039 searches the position informationmanagement table 1032 for the address of the radiotelephone terminal 101located at an area address notified from the server 108 a, and transmitsthe retrieved address of the radiotelephone terminal 101 as thedestination address to the server 108 a.

In the third embodiment, the server 108 a is made not to manage positioninformation of the PHS terminal 101, so that the position informationmanagement table 1082 a and the position information obtaining unit 1081become unnecessary. For this reason, the switching equipment 103 b sendsinformation necessary for conversion of the destination 301 of themessage to the server 108 a.

FIG. 27 is a sequence diagram when the server 108 a transmits a message.

FIG. 27A shows a process that when the server 108 a receives a message,the server 108 a requests the switching equipment 103 b to transmitinformation.

In the server 108 a, when the message receiving unit 1083 receives amessage from the information processing terminal 109, the radiotelephoneterminal determining unit 1084 refers to the area address managementtable 1901 in the area address management table memory 1082 a, anddetermines an area number corresponding to the area address set in theaddress 301 in the received message. The server 108 a notifies thedetermined area number to the switching equipment 103 b through thedestination address obtaining unit 1801 a.

In response, the switching equipment 103 b, by using the radiotelephoneterminal determining unit 1039, refers to the position informationmanagement table 401 stored in the position information management tablememory 103 and obtains the PHS number of the radiotelephone (PHS)terminal 101 located in the area indicated by the notified area numberThe switching equipment 103 b notifies the obtained PHS number as thedestination address to the server 108 a.

When the destination address obtaining unit 1081 a receives the PHSnumber from the switching equipment 103 b, the server 108 notifies thePHS number to the radiotelephone terminal determining unit 1084. Inresponse, the radiotelephone terminal determining unit 1084 converts thedestination address 301 of the message to the notified PHS number, andthe server 108 a transmits the PHS number to the switching equipment 103b through the message transmitting unit 1087.

FIG. 27B shows a process that the server 108 a stores a message and thenthe switching equipment 103 b requests the server 108 a to transmit themessage.

When receiving a message from the information processing terminal 109,the server 108 a does not transmit the message immediately, but storesthe message in the untransmitted message memory 1090 after sorting inits corresponding area address, which is set in the address 301 of themessage.

On the other hand, the switching equipment 103 b, by using theradiotelephone terminal determining unit 1039, periodically refers tothe position information management table 401 stored in the positioninformation management table memory 1032, and designates an area number,and notifies the area number and a PHS number of the PHS terminal in thearea determined by the area number to the server 108 a, thereby requeststhe server 108 a to transmit a relevant message. In designating the areanumber, the area numbers stored in the position information managementtable 401 may be designated in a sequential order. Or, the area numbersfrom which the area number designated last time (not necessarily limitedto one area number) has been excluded from the position informationmanagement table 401 may be designated.

The server 108 a, when receiving a notification of an area number, whichis designated by the switching equipment 103 b, and a PHS numbercorresponding to the area number, notifies the area number and thecorresponding PHS number to the radiotelephone terminal determining unit1084. In response, the radiotelephone terminal, determining unit 1084refers to the area address management table 1901 stored in the areaaddress management table memory 1082 a to see if any message, in whichthe area address corresponding to the specified area number is set inthe destination address 301, is stored in the untransmitted messagememory 1090. If this message is stored, the radiotelephone terminaldetermining unit 1084 converts the address in the message to thespecified PHS number, and the server 108 a transmits the message to theswitching equipment 103 b through the message transmitting unit 1087.

FIG. 27C shows a process that when the movement of a PHS terminal 101 isdetected, the switching equipment 103 b requests the server 108 a totransmit a message. When receiving a message from the informationprocessing terminal 109, the server 108 a does not transmit the messagebut stores in the untransmitted message memory 1090 in its correspondingarea address, which is set in the destination address 301 of themessage.

On the other hand, in the switching equipment 103 b, when the positioninformation management table 401 in the position information managementtable memory 1032 has been updated by its radiotelephone terminaldetermining unit 1039, in other words, when the PHS terminal 101 hasmoved from one area to another, suppose that there is none other thanthe PHS terminal 101 in the area to which the PHS terminal 101 moved.More specifically, when only one PHS number registered in the areaaddress at which one PHS number is added, the switching equipment 103 bdesignates the area number at that area address, and notifies the areanumber and one PHS number registered related to the area number to theserver 108 a, and thereby requests the server 108 a to transmit amessage.

When receiving the designated area number and the PHS number related tothe area number from the switching equipment 103 b through thedestination address obtaining means 1081 a, the server 108 a notifiesthe area number and the corresponding PHS number to the radiotelephoneterminal determining unit 1084. In response, the radiotelephone terminaldetermining unit 1084 refers to the area address management table 1091stored in the area address management table memory 1082 a to check if amessage, for which an area address corresponding to the designated areanumber is set in the address 301 of the message, is stored in theuntransmitted message memory 1090. If such a message is stored, theserver 108 a converts the address 301 of the message to the designatedPHS number, and transmits the message to the switching equipment 103 bthrough the message transmitting unit 1087.

As has been described, according to the third embodiment, even thoughthe server 108 a does not manage position information of PHS terminals101, the same effects as in the first embodiment can be obtained. Inother words, the user at a message transmission source can transmit amessage only by specifying a condition of space (or conditions of spaceand time) to an unspecified user who meets the condition or conditionswithout knowing the location or the address of the user moving from onearea to another. Therefore, it is possible for a user moving from oneplace to another to receive a message that is appropriate to the place(the place and time).

In the third embodiment, communication between the switching equipment103 b and the server 108 a can be improved all the more because theserver 108 a need not manage position information about PHS terminals101. Therefore, the third embodiment is effective when it is applied toprivate exchanges for limited ranges, not to the switching equipment 103b in an existing mobile telephone network 104.

Description will be made of some applied examples of the thirdembodiments.

APPLIED EXAMPLE 1

In the foregoing description of the third embodiment, the user at themessage transmission source was supposed to be a user at the informationprocessing terminal 109, but may be a user at a telephone terminal 110or at a PHS terminal 101.

The user at a telephone terminal 110 or a PHS terminal 101 can generatea message to transmit by a combination of numeric buttons as with aradio paging portable receiver. In this case, the address 301 of amessage is a telephone number, and a message does not pass through theserver 108 a, so that the address 301 needs to undergo conversion by theswitching equipment 103 b.

More specifically, in this first applied example, if a specifictelephone number to be set in the address 301 has been related to anarea address in advance in a telephone terminal 110 or a PHS terminal101. When the user at the telephone terminal 110 or the PHS terminal 101designates an area address on a message, the message with thecorresponding telephone number set in the address 301 is transmitted tothe switching equipment 103 b.

Here, an applied example of the user interface at a telephone terminal110 or a PHS terminal 101 will be described briefly. For example, asshown in FIG. 28, if a table showing correspondence among informationrepresenting the actual areas (plant numbers for example), the areaaddresses and particular telephone numbers is presented on the displayand the user at a telephone terminal 110 or a PHS terminal 101 selects adesired item on the table, the telephone number corresponding to theselected item can be set in the address 301 on a message.

On the other hand, the switching equipment 103 b has the telephonenumbers to be set in the address 301 and the area numbers associatedwith each other and receives a message from a telephone terminal 110 orPHS terminal 101, the switching equipment 103 b determines the user (PHSterminal 101) located in the area represented by the area numbercorresponding to the telephone number set in the address 301, andtransmits the message to the determined PHS terminal 101.

FIG. 29 is a conceptual diagram showing the flow of a message in thisfirst applied example.

As shown in FIG. 29, in this first applied example, a message sent fromthe telephone terminal 110 is transmitted by the switching equipment 103b to the information processing terminal 105 connected to the PHSterminal 101 located in “area 1”.

APPLIED EXAMPLE 2

In the third embodiment, like in the first embodiment, when there are aplurality of users in the same area, the switching equipment 103 b maybe adapted to select one user when he or she transmits, or like in thethird applied example of the first embodiment, the switching equipment103 b may be adapted not to select one user, but broadcast the messageto all users located in the same area.

It may be arranged that the user at the message transmission source canmake a request for message broadcast and that the switching equipment103 b can make a decision whether to select one user depending onwhether there is an outstanding broadcast request or not.

In the second applied example, like in the first applied example, if theuser at the message transmission source is a user at a telephoneterminal 110 or a PHS terminal 101, the user at the transmission sourcemay make a request for voice message broadcast.

As has been described, according to the present invention, the messagesender can transmit a message only by specifying a condition of space(or conditions of space and time) to an unspecified user who meets thecondition or conditions without specifying the recipient of the message.Therefore, a user moving from place to place can receive a message thatis appropriate to the place (or the place and time).

Thus, it become possible to carry out communication between users mostsuitable in terms of space (or in terms of space and time).

1. A message transmission system in which a message transmissionapparatus transmits a message created by a message creating apparatus toan apparatus having radio communication means, wherein said messagecreating apparatus comprises: means for creating a transmission messagehaving an area address which indicates an area as a destination, andmeans for transmitting said transmission message to said messagetransmission apparatus, and wherein said message transmission apparatuscomprises: means for receiving said transmission message, storage meansfor storing said received transmission message, means for checkingwhether said apparatus having said radio communication means exists inan area indicated by said area address which is set in said transmissionmessage as a destination, means for waiting for an arrival of saidapparatus having said radio communication means in said area, if saidapparatus having said radio communication means does not exist in saidarea, and means for transmitting said transmission message having a useraddress of said apparatus having said radio communication means as adestination if said apparatus having radio communication means exists insaid area.